WO2021024998A1 - Reactor - Google Patents

Reactor Download PDF

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Publication number
WO2021024998A1
WO2021024998A1 PCT/JP2020/029731 JP2020029731W WO2021024998A1 WO 2021024998 A1 WO2021024998 A1 WO 2021024998A1 JP 2020029731 W JP2020029731 W JP 2020029731W WO 2021024998 A1 WO2021024998 A1 WO 2021024998A1
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Prior art keywords
catalyst
reactor
heater
heat insulating
metal case
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PCT/JP2020/029731
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French (fr)
Japanese (ja)
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諭史 吉田
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日立造船株式会社
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Publication of WO2021024998A1 publication Critical patent/WO2021024998A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/86—Catalytic processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/24—Stationary reactors without moving elements inside
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J35/00—Catalysts, in general, characterised by their form or physical properties
    • B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties

Definitions

  • the present invention relates to a reactor.
  • Reactors that treat exhaust gas and the like using catalysts are known.
  • carbon, sulfur, and the like may adhere to the catalyst with use, and the catalytic activity may decrease. Therefore, it has been studied to recover the catalytic activity by removing the components adhering to the catalyst by heating.
  • an exhaust gas denitration purification device including a denitration catalyst layer and a heater arranged on the outer peripheral surface of the container of the denitration catalyst layer has been proposed (see, for example, Patent Document 1).
  • the heater heats the denitration catalyst layer in an air atmosphere to recover the lowered denitration performance.
  • a modularized catalyst including a storage frame and a plurality of catalyst elements stored in the storage frame has been proposed (see, for example, Patent Document 2).
  • the heater described in Patent Document 1 When the heater described in Patent Document 1 is applied to the modularized catalyst described in Patent Document 2, the heater is arranged on the outer peripheral surface of the storage frame for accommodating a plurality of catalyst elements.
  • the heater heats a plurality of catalyst elements, a temperature distribution occurs inside the storage frame, and there is a possibility that some of the catalyst elements among the plurality of catalyst elements cannot be sufficiently heated. Therefore, it is not possible to efficiently remove the components adhering to the plurality of catalyst elements, and there is a limit to the recovery of the catalytic activity of the plurality of catalyst elements.
  • the present invention provides a reactor capable of efficiently recovering the catalytic activity of a plurality of catalytic elements.
  • the present invention [1] includes a reactor including a plurality of catalyst elements and a plurality of heaters covering each of the plurality of catalyst elements.
  • each of the plurality of heaters covers the catalyst element one by one, the heater can stably heat the corresponding catalyst element. Therefore, the components adhering to each catalyst element can be sufficiently removed, and the catalytic activity of the plurality of catalyst elements can be efficiently restored.
  • the present invention [2] includes the reactor according to the above [1], further comprising a heat insulating material covering the plurality of heaters.
  • the heat insulating material covers each heater, it is possible to suppress the heat from the heater from being released to the outside. Therefore, the heater can heat the corresponding catalyst element more stably.
  • the present invention [3] includes a plurality of metal cases accommodating each catalyst element and each heater, and the heat insulating material is filled between each heater and each metal case.
  • the reactor according to [2] is included.
  • the metal case covers the heat insulating material and can protect the relatively brittle heat insulating material.
  • the catalytic activity of a plurality of catalytic elements can be efficiently restored.
  • FIG. 1 is a perspective view of a first embodiment of the reactor of the present invention.
  • FIG. 2A is a plan view of the reactor shown in FIG.
  • FIG. 2B is a bottom view of the reactor shown in FIG.
  • FIG. 3 is a sectional view taken along the line AA of the reactor shown in FIG. 2A.
  • FIG. 4 is a plan view of a second embodiment of the reactor of the present invention.
  • FIG. 5 is a cross-sectional view taken along the line AA of the third embodiment of the reactor of the present invention.
  • the reactor 1 as the first embodiment of the reactor of the present invention will be described with reference to FIGS. 1 to 3.
  • the reactor 1 is a reactor for purifying a gas to be treated (for example, exhaust gas) by using a catalyst.
  • a gas to be treated for example, exhaust gas
  • Examples of the components to be removed contained in the gas to be treated include nitrogen oxides (NO x ), volatile organic compounds (VOC), hydrocarbons (HC) and the like.
  • the gas to be treated may contain the component to be removed alone or may have two or more of them in combination.
  • the reactor 1 is configured to allow the gas to be processed to pass through.
  • the mode in which the passage direction of the gas to be processed in the reactor 1 is the vertical direction will be described, but the passage direction of the gas is not particularly limited.
  • the reactor 1 includes a case 2 and a plurality of catalyst modules 3.
  • the reactor 1 includes four catalyst modules 3, but the number of catalyst modules 3 included in the reactor 1 is not particularly limited.
  • the number of catalyst modules 3 included in the reactor 1 is, for example, 1 or more and 16 or less.
  • FIG. 2A shows the upper surface of the reactor 1
  • FIG. 2B shows the lower surface of the reactor 1.
  • the case 2 has a hollow shape and accommodates a plurality of catalyst modules 3.
  • the case 2 includes a side wall 4 and a support portion 5.
  • the side wall 4 has a square tube shape extending in the vertical direction.
  • the shape of the side wall 4 is not particularly limited, and may be, for example, a cylindrical shape.
  • Examples of the material of the side wall 4 include stainless steel.
  • the support portion 5 is located at the lower end in the internal space of the side wall 4.
  • the support portion 5 is supported by the lower end portion of the side wall 4.
  • the support portion 5 allows the passage of the gas to be processed in the vertical direction.
  • the support portion 5 has a grid shape having a plurality of openings. Examples of the material of the support portion 5 include stainless steel.
  • the plurality of catalyst modules 3 are housed in the side wall 4 and supported by the support portion 5.
  • the plurality of catalyst modules 3 may be fixed to the case 2 or may be detachable from the case 2.
  • Each of the plurality of catalyst modules 3 has a prismatic shape extending in the vertical direction.
  • the shape of each catalyst module 3 is not particularly limited, and may be, for example, a cylindrical shape.
  • each of the plurality of catalyst modules 3 includes a catalyst element 6, a first metal case 7, a heater 8, a heat insulating material 9, and a second metal case 10. That is, the reactor 1 includes a plurality of catalyst elements 6, a plurality of first metal cases 7, a plurality of heaters 8, a plurality of heat insulating materials 9, and a plurality of second metal cases 10.
  • the catalyst element 6 includes a catalyst and a carrier that supports the catalyst.
  • the catalyst include a denitration catalyst, a VOC decomposition catalyst, an HC decomposition catalyst and the like.
  • the catalyst is appropriately selected according to the components to be removed contained in the gas to be treated. For example, when the gas to be treated contains nitrogen oxides, the catalyst includes a denitration catalyst.
  • the catalyst can be used alone or in combination of two or more.
  • the carrier allows the passage of the gas to be processed in the vertical direction.
  • the shape of the carrier is not particularly limited, and examples thereof include a shape in which corrugated plates and flat plates are alternately laminated. Examples of such a carrier include the catalyst-supporting structure described in Japanese Patent No. 6228727.
  • the first metal case 7 houses the catalyst element 6.
  • the first metal case 7 has a square tubular shape extending in the vertical direction. Examples of the material of the first metal case 7 include stainless steel.
  • the heater 8 covers the catalyst element 6 via the first metal case 7 in a direction orthogonal to the vertical direction.
  • the heater 8 is located on the opposite side of the catalyst element 6 with respect to the first metal case 7, and surrounds the first metal case 7.
  • the heater 8 is composed of, for example, a seat heater, and is arranged along the entire outer surface of the first metal case 7.
  • the heater 8 has a square cylinder shape extending in the vertical direction.
  • the heat insulating material 9 covers the heater 8 in a direction orthogonal to the vertical direction.
  • the heat insulating material 9 is located on the opposite side of the catalyst element 6 with respect to the heater 8 and surrounds the heater 8.
  • the heat insulating material 9 is filled between the heater 8 and the second metal case 10.
  • Examples of the material of the heat insulating material 9 include inorganic fibers, and specific examples thereof include glass fibers and ceramic fibers (for example, alumina fibers).
  • the second metal case 10 houses the catalyst element 6, the first metal case 7, the heater 8, and the heat insulating material 9.
  • the second metal case 10 has a square tube shape extending in the vertical direction.
  • a heater 8 and a heat insulating material 9 are arranged between the first metal case 7 and the second metal case 10. Examples of the material of the second metal case 10 include stainless steel.
  • the plurality of catalyst modules 3 are housed in the case 2 so that the second metal cases 10 are in contact with each other.
  • the plurality of catalyst modules 3 may be housed in the case 2 at intervals from each other, or a cushioning material may be filled between the plurality of catalyst modules 3.
  • a method for recovering the catalytic activity is carried out at predetermined intervals.
  • the oxygen-containing gas is passed through the reactor 1, and the catalyst element 6 corresponding to each heater 8 is heated via the first metal case 7.
  • the heating temperature of each catalyst element 6 is, for example, 250 ° C. or higher, preferably 350 ° C. or higher, for example, 800 ° C. or lower, preferably 600 ° C. or lower.
  • the heating time of each catalyst element 6 is, for example, 1 hour or more, preferably 2 hours or more, for example, 5 hours or less, preferably 4 hours or less.
  • each of the plurality of heaters 8 covers the corresponding catalyst element 6 one by one. Therefore, in the method for recovering the catalytic activity in the reactor 1, each heater 8 can stably heat the corresponding catalyst element 6. As a result, the components adhering to each catalyst element 6 can be efficiently removed, and the catalytic activity of the plurality of catalyst elements 6 can be stably restored.
  • the heat insulating material 9 covers each heater 8. Therefore, in the method of recovering the catalytic activity in the reactor 1, it is possible to suppress the heat released from the heater 8 to the outside. As a result, the heater 8 can heat the corresponding catalyst element 6 more stably.
  • the heat from the heater 8 can be suppressed from being released to the outside, the level of heat resistance required for the case 2 (side wall 4 and support portion 5) of the reactor 1 can be reduced. Therefore, the degree of freedom in material selection in Case 2 can be improved. Specifically, as the material of the case 2, mild steel having inferior heat resistance as compared with the material of the first metal case 7 can be adopted.
  • the heat insulating material 9 is filled between the heater 8 and the second metal case 10 in each catalyst module 3. Therefore, the second metal case 10 covers the heat insulating material 9, and can protect the relatively brittle heat insulating material 9.
  • each catalyst module 3 is provided with a heat insulating material 9, and the heat insulating material 9 is filled between the heater 8 and the second metal case 10, but the reactor 1 is configured. Is not limited to this.
  • each catalyst module 3 includes a catalyst element 6, a first metal case 7, and a heater 8.
  • the heat insulating material 9 is filled between the heater 8 of each catalyst module 3 and the side wall 4.
  • each catalyst module 3 includes a catalyst element 6, a first metal case 7, and a heater 8. Even with such a third embodiment, the same effects as those of the first embodiment described above can be obtained.
  • the case 2 (side wall 4 and support portion 5) of the reactor 1 is required to have excellent heat resistance. Therefore, the first embodiment and the second embodiment are preferable from the viewpoint of the degree of freedom in selecting the material of Case 2.
  • the catalyst module 3 includes the first metal case 7 and the heater 8 covers the first metal case 7, but the present invention is not limited thereto.
  • the heater 8 may directly cover the catalyst element 6. Even with such a modification, the same effect as that of the first embodiment described above can be obtained.
  • the reactor of the present invention is suitably used, for example, for treating a target gas such as exhaust gas, particularly for treating nitrogen oxides contained in the target gas.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Biomedical Technology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Exhaust Gas Treatment By Means Of Catalyst (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Catalysts (AREA)

Abstract

This reactor 1 is provided with: a plurality of catalytic elements 6; and a plurality of heaters 8 which respectively cover the plurality of catalytic elements 6.

Description

反応器Reactor
　本発明は、反応器に関する。 The present invention relates to a reactor.
　触媒を利用して排ガスなどを処理する反応器が知られている。このような反応器では、使用に伴って炭素や硫黄などが触媒に付着し、触媒活性が低下する場合がある。そこで、触媒に対する付着成分を加熱により除去して、触媒活性を回復することが検討されている。 Reactors that treat exhaust gas and the like using catalysts are known. In such a reactor, carbon, sulfur, and the like may adhere to the catalyst with use, and the catalytic activity may decrease. Therefore, it has been studied to recover the catalytic activity by removing the components adhering to the catalyst by heating.
　例えば、脱硝触媒層と、脱硝触媒層の容器外周面に配置されるヒータとを備える排ガスの脱硝浄化装置が提案されている（例えば、特許文献１参照）。 For example, an exhaust gas denitration purification device including a denitration catalyst layer and a heater arranged on the outer peripheral surface of the container of the denitration catalyst layer has been proposed (see, for example, Patent Document 1).
　そして、そのような脱硝浄化装置では、空気雰囲気下において、ヒータが脱硝触媒層を加熱して、低下した脱硝性能を回復させる。 Then, in such a denitration purification device, the heater heats the denitration catalyst layer in an air atmosphere to recover the lowered denitration performance.
　また、そのような反応器では、触媒の取扱性の観点から、触媒をモジュール化することが望まれている。 Further, in such a reactor, it is desired to modularize the catalyst from the viewpoint of the handleability of the catalyst.
　例えば、収納枠と、収納枠に収納される複数の触媒エレメントとを備えるモジュール化触媒が提案されている（例えば、特許文献２参照）。 For example, a modularized catalyst including a storage frame and a plurality of catalyst elements stored in the storage frame has been proposed (see, for example, Patent Document 2).
特開２００６－２２０１０７号公報Japanese Unexamined Patent Publication No. 2006-220107 特開平６－２６９６７９号公報Japanese Unexamined Patent Publication No. 6-269679
　しかるに、特許文献２に記載のモジュール化触媒においても、各触媒エレメントに付着成分が付着して、触媒エレメントの触媒活性が低下する場合がある。そこで、特許文献２に記載のモジュール化触媒に特許文献１に記載のヒータを適用することが検討される。 However, even in the modularized catalyst described in Patent Document 2, an adhering component may adhere to each catalyst element, and the catalytic activity of the catalyst element may decrease. Therefore, it is considered to apply the heater described in Patent Document 1 to the modularized catalyst described in Patent Document 2.
　特許文献２に記載のモジュール化触媒に特許文献１に記載のヒータを適用すると、ヒータは、複数の触媒エレメントを収納する収納枠の外周面に配置される。この場合、ヒータが複数の触媒エレメントを加熱するときに、収納枠の内部において温度分布が生じ、複数の触媒エレメントのうち一部の触媒エレメントを十分に加熱できないおそれがある。そのため、複数の触媒エレメントに対する付着成分を効率的に除去できず、複数の触媒エレメントの触媒活性の回復には限度がある。 When the heater described in Patent Document 1 is applied to the modularized catalyst described in Patent Document 2, the heater is arranged on the outer peripheral surface of the storage frame for accommodating a plurality of catalyst elements. In this case, when the heater heats a plurality of catalyst elements, a temperature distribution occurs inside the storage frame, and there is a possibility that some of the catalyst elements among the plurality of catalyst elements cannot be sufficiently heated. Therefore, it is not possible to efficiently remove the components adhering to the plurality of catalyst elements, and there is a limit to the recovery of the catalytic activity of the plurality of catalyst elements.
　本発明は、複数の触媒エレメントの触媒活性を効率的に回復させることができる反応器を提供する。 The present invention provides a reactor capable of efficiently recovering the catalytic activity of a plurality of catalytic elements.
　本発明［１］は、複数の触媒エレメントと、前記複数の触媒エレメントのそれぞれを覆う複数のヒータとを備える、反応器を含む。 The present invention [1] includes a reactor including a plurality of catalyst elements and a plurality of heaters covering each of the plurality of catalyst elements.
　このような構成によれば、複数のヒータのそれぞれが触媒エレメントを１つずつ覆っているので、ヒータが対応する触媒エレメントを安定して加熱することができる。そのため、各触媒エレメントに対する付着成分を十分に除去することができ、複数の触媒エレメントの触媒活性を効率的に回復させることができる。 According to such a configuration, since each of the plurality of heaters covers the catalyst element one by one, the heater can stably heat the corresponding catalyst element. Therefore, the components adhering to each catalyst element can be sufficiently removed, and the catalytic activity of the plurality of catalyst elements can be efficiently restored.
　本発明［２］は、前記複数のヒータを覆う断熱材をさらに備える、上記［１］に記載の反応器を含む。 The present invention [2] includes the reactor according to the above [1], further comprising a heat insulating material covering the plurality of heaters.
　このような構成によれば、断熱材が各ヒータを覆うので、ヒータからの熱が外部に放出されることを抑制できる。そのため、ヒータは、対応する触媒エレメントをより安定して加熱することができる。 According to such a configuration, since the heat insulating material covers each heater, it is possible to suppress the heat from the heater from being released to the outside. Therefore, the heater can heat the corresponding catalyst element more stably.
　本発明［３］は、各前記触媒エレメントおよび各前記ヒータを収容する金属ケースを複数備え、前記断熱材は、各前記ヒータと各前記金属ケースとの間に充填されている、上記［１］または［２］に記載の反応器を含む。 The present invention [3] includes a plurality of metal cases accommodating each catalyst element and each heater, and the heat insulating material is filled between each heater and each metal case. Alternatively, the reactor according to [2] is included.
　このような構成によれば、断熱材が各ヒータと各金属ケースとの間に充填されているので、金属ケースは、断熱材を覆っており、比較的脆い断熱材を保護することができる。 According to such a configuration, since the heat insulating material is filled between each heater and each metal case, the metal case covers the heat insulating material and can protect the relatively brittle heat insulating material.
　本発明の反応器では、複数の触媒エレメントの触媒活性を効率的に回復させることができる。 In the reactor of the present invention, the catalytic activity of a plurality of catalytic elements can be efficiently restored.
図１は、本発明の反応器の第１実施形態の斜視図である。FIG. 1 is a perspective view of a first embodiment of the reactor of the present invention. 図２Ａは、図１に示す反応器の平面図である。図２Ｂは、図１に示す反応器の底面図である。FIG. 2A is a plan view of the reactor shown in FIG. FIG. 2B is a bottom view of the reactor shown in FIG. 図３は、図２Ａに示す反応器のＡ－Ａ断面図である。FIG. 3 is a sectional view taken along the line AA of the reactor shown in FIG. 2A. 図４は、本発明の反応器の第２実施形態の平面図である。FIG. 4 is a plan view of a second embodiment of the reactor of the present invention. 図５は、本発明の反応器の第３実施形態のＡ－Ａ断面図である。FIG. 5 is a cross-sectional view taken along the line AA of the third embodiment of the reactor of the present invention.
　１．反応器
　本発明の反応器の第１実施形態としての反応器１を、図１から図３を参照して説明する。反応器１は、触媒を利用して、処理対象ガス（例えば、排ガスなど）を浄化するための反応器である。処理対象ガスが含有する除去対象成分として、例えば、窒素酸化物（ＮＯｘ）、揮発性有機化合物（ＶＯＣ）、炭化水素（ＨＣ）などが挙げられる。処理対象ガスは、除去対象成分を単独で含有してもよく、２種以上併有してもよい。 1. 1. Reactor The reactor 1 as the first embodiment of the reactor of the present invention will be described with reference to FIGS. 1 to 3. The reactor 1 is a reactor for purifying a gas to be treated (for example, exhaust gas) by using a catalyst. Examples of the components to be removed contained in the gas to be treated include nitrogen oxides (NO x ), volatile organic compounds (VOC), hydrocarbons (HC) and the like. The gas to be treated may contain the component to be removed alone or may have two or more of them in combination.
　反応器１は、処理対象ガスが通過可能に構成されている。以下では、便宜上、反応器１における処理対象ガスの通過方向が、上下方向である態様について説明するが、ガスの通過方向は、特に制限されない。 The reactor 1 is configured to allow the gas to be processed to pass through. Hereinafter, for convenience, the mode in which the passage direction of the gas to be processed in the reactor 1 is the vertical direction will be described, but the passage direction of the gas is not particularly limited.
　図１に示すように、反応器１は、ケース２と、複数の触媒モジュール３とを備える。図１では、反応器１が４つの触媒モジュール３を備えるが、反応器１が備える触媒モジュール３の個数は、特に制限されない。反応器１が備える触媒モジュール３の個数は、例えば、１以上１６以下である。 As shown in FIG. 1, the reactor 1 includes a case 2 and a plurality of catalyst modules 3. In FIG. 1, the reactor 1 includes four catalyst modules 3, but the number of catalyst modules 3 included in the reactor 1 is not particularly limited. The number of catalyst modules 3 included in the reactor 1 is, for example, 1 or more and 16 or less.
　図２Ａは、反応器１の上面を示し、図２Ｂは、反応器１の下面を示す。図２Ａおよび図２Ｂに示すように、ケース２は、中空形状を有し、複数の触媒モジュール３を収容する。
ケース２は、側壁４と、支持部５とを備える。 FIG. 2A shows the upper surface of the reactor 1, and FIG. 2B shows the lower surface of the reactor 1. As shown in FIGS. 2A and 2B, the case 2 has a hollow shape and accommodates a plurality of catalyst modules 3.
The case 2 includes a side wall 4 and a support portion 5.
　側壁４は、上下方向に延びる角筒形状を有する。なお、側壁４の形状は、特に制限されず、例えば、円筒形状であってもよい。側壁４の材料として、例えば、ステンレスなどが挙げられる。 The side wall 4 has a square tube shape extending in the vertical direction. The shape of the side wall 4 is not particularly limited, and may be, for example, a cylindrical shape. Examples of the material of the side wall 4 include stainless steel.
　支持部５は、側壁４の内部空間における下端に位置する。支持部５は、側壁４の下端部に支持される。支持部５は、上下方向における処理対象ガスの通過を許容する。支持部５は、複数の開口を備える格子形状を有する。支持部５の材料として、例えば、ステンレスなどが挙げられる。 The support portion 5 is located at the lower end in the internal space of the side wall 4. The support portion 5 is supported by the lower end portion of the side wall 4. The support portion 5 allows the passage of the gas to be processed in the vertical direction. The support portion 5 has a grid shape having a plurality of openings. Examples of the material of the support portion 5 include stainless steel.
　複数の触媒モジュール３は、側壁４内に収容され、支持部５に支持される。複数の触媒モジュール３は、ケース２に固定されていてもよく、ケース２から着脱可能であってもよい。複数の触媒モジュール３のそれぞれは、上下方向に延びる角柱形状を有する。なお、各触媒モジュール３の形状は、特に制限されず、例えば、円柱形状であってもよい。 The plurality of catalyst modules 3 are housed in the side wall 4 and supported by the support portion 5. The plurality of catalyst modules 3 may be fixed to the case 2 or may be detachable from the case 2. Each of the plurality of catalyst modules 3 has a prismatic shape extending in the vertical direction. The shape of each catalyst module 3 is not particularly limited, and may be, for example, a cylindrical shape.
　図２Ａおよび図３に示すように、複数の触媒モジュール３のそれぞれは、触媒エレメント６と、第１金属ケース７と、ヒータ８と、断熱材９と、第２金属ケース１０とを備える。つまり、反応器１は、複数の触媒エレメント６と、複数の第１金属ケース７と、複数のヒータ８と、複数の断熱材９と、複数の第２金属ケース１０とを備える。 As shown in FIGS. 2A and 3, each of the plurality of catalyst modules 3 includes a catalyst element 6, a first metal case 7, a heater 8, a heat insulating material 9, and a second metal case 10. That is, the reactor 1 includes a plurality of catalyst elements 6, a plurality of first metal cases 7, a plurality of heaters 8, a plurality of heat insulating materials 9, and a plurality of second metal cases 10.
　触媒エレメント６は、触媒と、触媒を担持する担体とを備える。触媒として、例えば、脱硝触媒、ＶＯＣ分解触媒、ＨＣ分解触媒などが挙げられる。触媒は、処理対象ガスが含有する除去対象成分に応じて適宜選択される。例えば、処理対象ガスが含有する窒素酸化物を含有する場合、触媒は、脱硝触媒を含む。触媒は、単独使用または２種以上併用することができる。担体は、上下方向における処理対象ガスの通過を許容する。担体の形状は、特に制限されないが、例えば、波板と平板とが交互に積層されて構成される形状が挙げられる。このような担体として、例えば、特許第６２２８７２７号公報に記載の触媒担持構造などが挙げられる。 The catalyst element 6 includes a catalyst and a carrier that supports the catalyst. Examples of the catalyst include a denitration catalyst, a VOC decomposition catalyst, an HC decomposition catalyst and the like. The catalyst is appropriately selected according to the components to be removed contained in the gas to be treated. For example, when the gas to be treated contains nitrogen oxides, the catalyst includes a denitration catalyst. The catalyst can be used alone or in combination of two or more. The carrier allows the passage of the gas to be processed in the vertical direction. The shape of the carrier is not particularly limited, and examples thereof include a shape in which corrugated plates and flat plates are alternately laminated. Examples of such a carrier include the catalyst-supporting structure described in Japanese Patent No. 6228727.
　第１金属ケース７は、触媒エレメント６を収容する。第１金属ケース７は、上下方向に延びる角筒形状を有する。第１金属ケース７の材料として、例えば、ステンレスなどが挙げられる。 The first metal case 7 houses the catalyst element 6. The first metal case 7 has a square tubular shape extending in the vertical direction. Examples of the material of the first metal case 7 include stainless steel.
　ヒータ８は、上下方向と直交する方向において、第１金属ケース７を介して、触媒エレメント６を覆っている。ヒータ８は、第１金属ケース７に対して触媒エレメント６の反対側に位置し、第１金属ケース７の周囲を囲んでいる。ヒータ８は、例えば、シートヒータからなり、第１金属ケース７の外面全体に沿うように配置されている。ヒータ８は、上下方向に延びる角筒形状を有する。 The heater 8 covers the catalyst element 6 via the first metal case 7 in a direction orthogonal to the vertical direction. The heater 8 is located on the opposite side of the catalyst element 6 with respect to the first metal case 7, and surrounds the first metal case 7. The heater 8 is composed of, for example, a seat heater, and is arranged along the entire outer surface of the first metal case 7. The heater 8 has a square cylinder shape extending in the vertical direction.
　断熱材９は、上下方向と直交する方向において、ヒータ８を覆っている。断熱材９は、ヒータ８に対して触媒エレメント６の反対側に位置し、ヒータ８の周囲を囲んでいる。断熱材９は、ヒータ８と第２金属ケース１０との間に充填されている。断熱材９の材料として、例えば、無機繊維などが挙げられ、具体的には、ガラス繊維、セラミック繊維（例えば、アルミナ繊維など）などが挙げられる。 The heat insulating material 9 covers the heater 8 in a direction orthogonal to the vertical direction. The heat insulating material 9 is located on the opposite side of the catalyst element 6 with respect to the heater 8 and surrounds the heater 8. The heat insulating material 9 is filled between the heater 8 and the second metal case 10. Examples of the material of the heat insulating material 9 include inorganic fibers, and specific examples thereof include glass fibers and ceramic fibers (for example, alumina fibers).
　第２金属ケース１０は、触媒エレメント６と、第１金属ケース７と、ヒータ８と、断熱材９とを収容する。第２金属ケース１０は、上下方向に延びる角筒形状を有する。第１金属ケース７と第２金属ケース１０との間には、ヒータ８および断熱材９が配置される。第２金属ケース１０の材料として、例えば、ステンレスなどが挙げられる。 The second metal case 10 houses the catalyst element 6, the first metal case 7, the heater 8, and the heat insulating material 9. The second metal case 10 has a square tube shape extending in the vertical direction. A heater 8 and a heat insulating material 9 are arranged between the first metal case 7 and the second metal case 10. Examples of the material of the second metal case 10 include stainless steel.
　そして、本実施形態では、複数の触媒モジュール３は、第２金属ケース１０が互いに接触するように、ケース２に収容されている。なお、複数の触媒モジュール３は、互いに間隔を空けてケース２に収容されてもよく、複数の触媒モジュール３の間に緩衝材が充填されてもよい。 Then, in the present embodiment, the plurality of catalyst modules 3 are housed in the case 2 so that the second metal cases 10 are in contact with each other. The plurality of catalyst modules 3 may be housed in the case 2 at intervals from each other, or a cushioning material may be filled between the plurality of catalyst modules 3.
　２．触媒活性の回復方法
　このような反応器１では、処理対象ガスを各触媒エレメント６に通過させながら、所定温度（例えば、２００℃以上４００℃以下）に加熱することにより、触媒作用によって除去対象成分が分解除去される。そして、そのような処理対象ガスの浄化処理が長期にわたって実施されると、各触媒エレメント６に炭素や硫黄などの付着成分が付着し、各触媒エレメント６の触媒活性が低下する。 2. 2. Method for recovering catalytic activity In such a reactor 1, the component to be removed by catalytic action is heated to a predetermined temperature (for example, 200 ° C. or higher and 400 ° C. or lower) while passing the gas to be treated through each catalyst element 6. Is decomposed and removed. When such purification treatment of the gas to be treated is carried out for a long period of time, adherent components such as carbon and sulfur adhere to each catalyst element 6, and the catalytic activity of each catalyst element 6 decreases.
　そのため、反応器１では、例えば、所定期間毎に触媒活性の回復方法が実施される。触媒活性の回復方法では、酸素含有ガスを反応器１に通過させるとともに、各ヒータ８が対応する触媒エレメント６を、第１金属ケース７を介して加熱する。 Therefore, in the reactor 1, for example, a method for recovering the catalytic activity is carried out at predetermined intervals. In the method for recovering the catalytic activity, the oxygen-containing gas is passed through the reactor 1, and the catalyst element 6 corresponding to each heater 8 is heated via the first metal case 7.
　各触媒エレメント６の加熱温度は、例えば、２５０℃以上、好ましくは、３５０℃以上、例えば、８００℃以下、好ましくは、６００℃以下である。各触媒エレメント６の加熱時間は、例えば、１時間以上、好ましくは、２時間以上、例えば、５時間以下、好ましくは、４時間以下である。 The heating temperature of each catalyst element 6 is, for example, 250 ° C. or higher, preferably 350 ° C. or higher, for example, 800 ° C. or lower, preferably 600 ° C. or lower. The heating time of each catalyst element 6 is, for example, 1 hour or more, preferably 2 hours or more, for example, 5 hours or less, preferably 4 hours or less.
　これによって、反応器１においてすべての触媒エレメント６が上記した加熱温度に一様に加熱され、触媒エレメント６に付着する付着成分が燃焼除去される。そのため、各触媒エレメント６の触媒活性が回復する。 As a result, in the reactor 1, all the catalyst elements 6 are uniformly heated to the above-mentioned heating temperature, and the adhered components adhering to the catalyst element 6 are burned and removed. Therefore, the catalytic activity of each catalytic element 6 is restored.
　３．作用効果
　反応器１では、複数のヒータ８のそれぞれが、対応する触媒エレメント６を１つずつ覆っている。そのため、反応器１における触媒活性の回復方法において、各ヒータ８が対応する触媒エレメント６を安定して加熱することができる。その結果、各触媒エレメント６に対する付着成分を効率的に除去することができ、複数の触媒エレメント６の触媒活性を安定して回復させることができる。 3. 3. Action Effect In the reactor 1, each of the plurality of heaters 8 covers the corresponding catalyst element 6 one by one. Therefore, in the method for recovering the catalytic activity in the reactor 1, each heater 8 can stably heat the corresponding catalyst element 6. As a result, the components adhering to each catalyst element 6 can be efficiently removed, and the catalytic activity of the plurality of catalyst elements 6 can be stably restored.
　また、断熱材９が、各ヒータ８を覆っている。そのため、反応器１における触媒活性の回復方法において、ヒータ８からの熱が外部に放出されることを抑制できる。その結果、ヒータ８は、対応する触媒エレメント６をより安定して加熱することができる。 In addition, the heat insulating material 9 covers each heater 8. Therefore, in the method of recovering the catalytic activity in the reactor 1, it is possible to suppress the heat released from the heater 8 to the outside. As a result, the heater 8 can heat the corresponding catalyst element 6 more stably.
　また、ヒータ８からの熱が外部に放出されることを抑制できるので、反応器１のケース２（側壁４および支持部５）に要求される耐熱性のレベルを低減することができる。そのため、ケース２の材料選択の自由度の向上を図ることができる。具体的には、ケース２の材料として、第１金属ケース７の材料と比較して耐熱性が劣る軟鋼を採用することができる。 Further, since the heat from the heater 8 can be suppressed from being released to the outside, the level of heat resistance required for the case 2 (side wall 4 and support portion 5) of the reactor 1 can be reduced. Therefore, the degree of freedom in material selection in Case 2 can be improved. Specifically, as the material of the case 2, mild steel having inferior heat resistance as compared with the material of the first metal case 7 can be adopted.
　また、断熱材９は、各触媒モジュール３において、ヒータ８と第２金属ケース１０との間に充填されている。そのため、第２金属ケース１０は、断熱材９を覆っており、比較的脆い断熱材９を保護することができる。 Further, the heat insulating material 9 is filled between the heater 8 and the second metal case 10 in each catalyst module 3. Therefore, the second metal case 10 covers the heat insulating material 9, and can protect the relatively brittle heat insulating material 9.
　４．第２実施形態
　次に、図４を参照して、本発明の第２実施形態について説明する。 4. Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG.
　第１実施形態では、図１に示すように、各触媒モジュール３が断熱材９を備え、断熱材９がヒータ８と第２金属ケース１０との間に充填されるが、反応器１の構成はこれに限定されない。 In the first embodiment, as shown in FIG. 1, each catalyst module 3 is provided with a heat insulating material 9, and the heat insulating material 9 is filled between the heater 8 and the second metal case 10, but the reactor 1 is configured. Is not limited to this.
　第２実施形態では、図４に示すように、断熱材９が、複数のヒータ８を一括して覆っている。この場合、各触媒モジュール３は、触媒エレメント６と、第１金属ケース７と、ヒータ８とからなる。そして、断熱材９は、各触媒モジュール３のヒータ８と、側壁４との間に充填されている。このような第２実施形態によっても、上記した第１実施形態と同様の作用効果を奏することができる。 In the second embodiment, as shown in FIG. 4, the heat insulating material 9 collectively covers the plurality of heaters 8. In this case, each catalyst module 3 includes a catalyst element 6, a first metal case 7, and a heater 8. The heat insulating material 9 is filled between the heater 8 of each catalyst module 3 and the side wall 4. Even with such a second embodiment, the same effects as those of the first embodiment described above can be obtained.
　５．第３実施形態
　次に、図５を参照して、本発明の第３実施形態について説明する。 5. Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG.
　第３実施形態では、図５に示すように、反応器１は、断熱材９を備えていない。この場合、各触媒モジュール３は、触媒エレメント６と、第１金属ケース７と、ヒータ８とからなる。このような第３実施形態によっても、上記した第１実施形態と同様の作用効果を奏することができる。一方、第３実施形態では、ヒータ８からの熱が外部に放出されるので、反応器１のケース２（側壁４および支持部５）に優れた耐熱性が要求される。そのため、ケース２の材料選択の自由度の観点から、第１実施形態および第２実施形態が好ましい。 In the third embodiment, as shown in FIG. 5, the reactor 1 does not include the heat insulating material 9. In this case, each catalyst module 3 includes a catalyst element 6, a first metal case 7, and a heater 8. Even with such a third embodiment, the same effects as those of the first embodiment described above can be obtained. On the other hand, in the third embodiment, since the heat from the heater 8 is released to the outside, the case 2 (side wall 4 and support portion 5) of the reactor 1 is required to have excellent heat resistance. Therefore, the first embodiment and the second embodiment are preferable from the viewpoint of the degree of freedom in selecting the material of Case 2.
　６．変形例
　上記した第１実施形態～第３実施形態では、触媒モジュール３が第１金属ケース７を備え、ヒータ８が第１金属ケース７を覆っているが、本発明はこれに限定されない。ヒータ８は、触媒エレメント６を直接覆っていてもよい。このような変形例によっても、上記した第１実施形態と同様の作用効果を奏することができる。 6. Modified Examples In the first to third embodiments described above, the catalyst module 3 includes the first metal case 7 and the heater 8 covers the first metal case 7, but the present invention is not limited thereto. The heater 8 may directly cover the catalyst element 6. Even with such a modification, the same effect as that of the first embodiment described above can be obtained.
　なお、上記発明は、本発明の例示の実施形態として提供したが、これは単なる例示に過ぎず、限定的に解釈してはならない。当該技術分野の当業者によって明らかな本発明の変形例は、後記請求の範囲に含まれる。 Although the above invention has been provided as an exemplary embodiment of the present invention, this is merely an example and should not be construed in a limited manner. Modifications of the present invention that will be apparent to those skilled in the art are included in the claims below.
　本発明の反応器は、例えば、排ガスなどの対象ガスの処理、とりわけ、対象ガスが含有する窒素酸化物の処理に好適に用いられる。 The reactor of the present invention is suitably used, for example, for treating a target gas such as exhaust gas, particularly for treating nitrogen oxides contained in the target gas.
　１　　　反応器
　６　　　触媒エレメント
　８　　　ヒータ
　９　　　断熱材
　１０　　第２金属ケース 1 Reactor 6 Catalyst element 8 Heater 9 Insulation 10 Second metal case

Claims (3)

  1. 　複数の触媒エレメントと、
    　前記複数の触媒エレメントのそれぞれを覆う複数のヒータと、を備えることを特徴とする、反応器。     With multiple catalytic elements
    A reactor comprising a plurality of heaters that cover each of the plurality of catalyst elements.
  2. 　前記複数のヒータを覆う断熱材をさらに備えることを特徴とする、請求項１に記載の反応器。 The reactor according to claim 1, further comprising a heat insulating material that covers the plurality of heaters.
  3. 　各前記触媒エレメントおよび各前記ヒータを収容する金属ケースを複数備え、
    　前記断熱材は、各前記ヒータと各前記金属ケースとの間に充填されていることを特徴とする、請求項１に記載の反応器。     A plurality of metal cases for accommodating each catalyst element and each heater are provided.
    The reactor according to claim 1, wherein the heat insulating material is filled between each heater and each metal case.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06327943A (en) * 1993-05-21 1994-11-29 Mitsubishi Heavy Ind Ltd Method for nox removal treatment
JPH11347371A (en) * 1998-06-06 1999-12-21 Isuzu Ceramics Res Inst Co Ltd Exhaust gas cleaning apparatus
JP2002221023A (en) * 2000-11-22 2002-08-09 Ooden:Kk Diesel particulate removing device
JP2011230114A (en) * 2010-04-09 2011-11-17 Ibiden Co Ltd Honeycomb structure
JP2014184426A (en) * 2012-11-08 2014-10-02 Shinshu Univ Gas purification device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06327943A (en) * 1993-05-21 1994-11-29 Mitsubishi Heavy Ind Ltd Method for nox removal treatment
JPH11347371A (en) * 1998-06-06 1999-12-21 Isuzu Ceramics Res Inst Co Ltd Exhaust gas cleaning apparatus
JP2002221023A (en) * 2000-11-22 2002-08-09 Ooden:Kk Diesel particulate removing device
JP2011230114A (en) * 2010-04-09 2011-11-17 Ibiden Co Ltd Honeycomb structure
JP2014184426A (en) * 2012-11-08 2014-10-02 Shinshu Univ Gas purification device

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